Paul,

     I had sort of an odd thought, and I'm not familiar enough with the
     the 13b to reason it out.  With a p-port engine, would it be
     possible to flip the rotor housings backwards and have the engine
     run in the opposite direction?

     Josh

     We have discussed this in the past and that is the first
  suggestion   that might work. The tension bolt pattern would not
  match up but if   you are building your own end housings that would
  not matter.

     Paul Lamar

   If you build your own end housings they could be designed so they
  are both including the bell housing pattern. That way they could be
  just turned around. For twins with reverse props, one engine turned
  around and a change to the PSRU if it has an internal oil pump. This
  way a dual supply of spare engines is eliminated.

   Dale Davies

  Don't forget about all the accessories such as the starter and the water
  pump.  They would not be happy running backwards.

   Mark LaPierre



 This is simpler than you are looking at. If you are building your own Al end
 housings, make the front one with the bell housing on it. If you build the
 e-shaft, make both ends like the Mazda rear with the taper. Then you can put
 an adapter like the flex plate or flywheel on. You put the ring gear and
 starter in the same place you always did. Just turn the whole assembly around.
 The drive is then reversed. The coolant pump would have to be mounted off the
 side, but should be fairly simple while doing CAD for the housings. Starter
 turns normal direction. Alternators may need to be turned around and mounted
 on the other side of the belts with a drive bolted to the ring gear hub. Same
 with the CAS on the e-shaft. With p-port you do not have ports in the end
 housings, so that simplifies that part. Makes room to mount the other needed
 accessories.

 Dale Davies



It's possible I'm not visualizing what you're talking about, but to be
clear, the alternator doesn't care which way it's turned..  It'll
wiggle its output happily either way it goes.  The diodes don't care
whether + comes first or -.  The fan is usually slightly more
efficient in one direction than the other, but not enough to matter..
Thought they do make reverse rotation cooling fans for some
applications.


Regards,

Matt-


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